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Simplifying -2(x + -3) + 7x = 21 Reorder the terms: -2(-3 + x) + 7x = 21 (-3 * -2 + x * -2) + 7x = 21 (6 + -2x) + 7x = 21 Combine like terms: -2x + 7x = 5x 6 + 5x = 21 Solving 6 + 5x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 5x = 21 + -6 Combine like terms: 6 + -6 = 0 0 + 5x = 21 + -6 5x = 21 + -6 Combine like terms: 21 + -6 = 15 5x = 15 Divide each side by '5'. x = 3 Simplifying x = 3
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